It's this video of a traffic stop escalating into a chaotic arrest that now has three deputy constables at the center of a federal lawsuit.

"That's Dahlin punching him in the head," said civil rights lawyer Randall Kallinen, showing us the video. "Here comes Drummond. 1...2...3...4...5; that's where he breaks his ribs."

Kallinen is representing David Scherz and his family, all claiming they were manhandled, abused and arrested by officers in the video from September 2011.

Kallinen told us there's been a lot of interest in the tape since publicly releasing the video this past weekend.

"A representative from the DA's office stopped by earlier this morning and picked up a copy of the video of the beating," said Kallinen.

Kallinen says he's hoping the DA's office will file official oppression and aggravated assault charges against the officers who he says used excessive force on his clients. The accused officers were deputy constables with Harris County Precinct 4 constable's office at the time of this incident.

Kallinen has identified Jimmy Drummond as the most aggressive deputy in this group. Drummond was a sergeant with Precinct 3 at the time. Sources tell Eyewitness News Drummond has been working as a captain with the Montgomery County Precinct 3 constable's office since August of last year.

When we called Captain Drummond on Tuesday, he told us no comment and hung up the phone.

"I had several law abiding citizens. I checked their records. They had no crimes on their record whatsoever," said Kallinen. "They have come to me and said they have run into Jimmy Drummond on traffic stops and he has been swearing, going berserk and crazy on them as well."

All criminal charges were dropped against Kallinen's clients back in June. The Precinct 4 Constable's Office says its internal affairs unit is investigating this case right now. They're expected to wrap up their investigation sometime this week.